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Contents Vol.36, No.10 October 2023 12 The History of Electronics, Pt1 We go over the brilliant scientists and inventors who discovered every aspect of electronics technology. They made modern inventions like transistors, ICs and wireless communication possible. By Dr David Maddison Electronic inventions & inventors 36 How to Photograph Electronics Taking quality photographs is beneficial for both hobby and business projects, and modern cameras make this much easier. We detail the other steps you should take to improve your photgraphy via your technique, lighting and ‘studio’ setup. By Kevin Poulter Photography feature 1kW+ Class-D Mono Amplifier Page 28 Photographing Electronics how to take better photos 54 The Linshang LS172 Colorimeter This colorimeter is an affordable way to verify that you have the right colours when buying paint or doing a print project. All you need to do is place it over the colour you want to measure and it will do the rest. By Allan Linton-Smith Test & measurement equipment review 82 1.3in Monochrome OLED Display The 1.3in (33mm) OLED display module has a resolution of 128x64 pixels and is perfect as a display for an Arduino or Micromite project due to its wide availability, I2C interface and cost. By Jim Rowe Using electronic modules 28 1kW+ Class-D Amplifier, Pt1 This Class-D monoblock amplifier is built using a pre-made amplifier module and six inexpensive 24-25V switchmode supplies. It delivers up to 1.2kW into 2W loads or over 500W into 4W! By Allan Linton-Smith Audio project Page 36 Page 64 TQFP Programming Adaptors 2 Editorial Viewpoint 5 Mailbag 61 Circuit Notebook 71 Subscriptions 88 Online Shop 90 Serviceman’s Log 98 Vintage Radio 44 2m Test Signal Generator This test oscillator uses an AD9834 DDS to produce signals in the 2m band (144-148MHz, in 500kHz steps), either carrier-only (no modulation) or FM. It does all this on a compact PCB that fits in a 3D-printed enclosure. By Andrew Woodfield, ZL2PD Test & measurement project 64 TQFP Programming Adaptors Following on from our PIC Programming Adaptor last month, we show you how to program SMD micros in SOT-23-6 and (T)QFP from 32 to 100 pins using reconfigurable jigs with high-quality sockets. By Nicholas Vinen Microcontroller project 72 30V 2A Bench Supply, Mk2 – Pt2 In the final part of our series, we explain how to build, test and calibrate the Supply so that you can use it for powering circuits or development. By John Clarke Power supply project 1. Mini inverter to power a soldering iron 2. Improved gesture recognition software 3. Pi Pico W BackPack ‘analog’ clock 4. Automatic AI Doorman IJA Chi receiver by Ian Batty 106 Ask Silicon Chip 111 Market Centre 112 Advertising Index 112 Notes & Errata